In the other ig pic source you can see well Sienna face too, and not only her top. And the girl of that ig source is a friend of Sienna and she was with them and tagged sienna on the pic. So it's for sure Sienna.

She is Sienna! That is the second pic of yesterday night http://t.co/0NQEai7go2There are no doubts it's her and she was tagged too! Sienna got her hair because she is filming American Sniper in LA. Here she is with quinn archer- brit musician whose music video features marcus foster and the girl of the ig source, the brit actress Tara Summers; both are friends of Sienna.

@Anna Maietta I've opened the pics link, thanks and @8ef68ab2............ yes, that is Selena, you can see her top in the first link and in the second link, she said it herself that she got her hair done brown.